/*
 * This file is part of spark.
 *
 *  Copyright (c) lucko (Luck) <luck@lucko.me>
 *  Copyright (c) contributors
 *
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package me.lucko.spark.common.util;

import org.jetbrains.annotations.VisibleForTesting;

public enum JavaVersion {
    ;

    private static final int JAVA_VERSION;
    static {
        JAVA_VERSION = parseJavaVersion(System.getProperty("java.version"));
    }

    @VisibleForTesting
    static int parseJavaVersion(String version) {
        if (version.startsWith("1.")) {
            // Java 8 and below
            return Integer.parseInt(version.substring(2, 3));
        } else {
            // Java 9 and above
            return Integer.parseInt(version.split("\\.|\\-")[0]);
        }
    }

    public static int getJavaVersion() {
        return JAVA_VERSION;
    }
}
